Abstract
Measurement-device-independent quantum key distribution (MDI-QKD) not only eliminates all detector side channel attacks, but also doubles the secure transmission distance. To improve the performance of MDI-QKD, we propose a high dimensional encoding scheme. By a spatial-temporal mode conversion circuit and quantum state fusion operation, two polarization modes of two photons are converted into the temporal-polarization mode of one photon. Also, by adding a temporal-spatial mode conversion circuit to quantum state fission apparatus, the temporal-polarization mode of one photon can be split into two polarization modes of two photons. By these two processes, each of the two legitimate parties is able to send photons in high dimensional temporal and polarization modes, and the measurement server still performs Bell state measurements (BSMs) after states fission. Hence, the total output rate can be improved. In addition, one of the recovered polarization states keeps stable for channel noise. The numerical simulation results show that by this new scheme, the key generation rate increases by 2∼10 times and transmission distance increases by 6∼60 km for different polarization misalignment errors.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 61372076, 61701375), Shaanxi Key Research and Development Program (Grant No. 2017GY-080), Foundation of Science and Technology on Communication Networks Laboratory (KX172600031) and the 111 Project (No. B08038).
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Li, L., Zhu, C., Quan, D. et al. A High Dimensional Measurement-Device-Independent Quantum Key Distribution Scheme Based on Optical Quantum State Fusion and Fission. Int J Theor Phys 57, 3902–3911 (2018). https://doi.org/10.1007/s10773-018-3902-4
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DOI: https://doi.org/10.1007/s10773-018-3902-4